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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af37548271abd0caae6c110e43d21e4f75a6035584e8aac0be670ea2c48f7e31' 
  AND token = 'q7Eejog/84Jvzt9EysjUVFNxb6fnrlYW+RE0CovXx0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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