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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4c64e5cb9ed160e57137302ce09ca58eb20b8bfc3346bf41220ba964b7cb71' 
  AND token = 'FlVVKF3ZbXF7bktI+duVFHtBRMtYJ2cmixynmRSu218=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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