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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc42c6cdba03fdea577f7ed93aaa01716a52e233953e495709888cb12425a631' 
  AND token = 'k3fYMGj/uKnCRoqSKGerxTnjz9eiiJuRalWhDtK+oM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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