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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c865febad9a1bf747f4641472cc0d177185107134a41a925a30fa9cc83e0cb98' 
  AND token = 'aJoN3ZtUn4rRaTIDv/wlYaVfThA6wKDXlQxohy7Zw5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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