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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5585657dada242d65ded4e7754cff08a44a31438a45583df19758dd6a075c1db' 
  AND token = '2m4JIndTxDCrkZwk0bJp3vZkw1DIUIsOSL78arVvndo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}