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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac897488389047499a3668db91d7720ed65dbb4c67b8aa7ebade8c970aeba1de' 
  AND token = 'b5Oc4hPfO3z7I2m2QXVRnKof5T62Pw8262cNJQRmkgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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