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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c025719d130f4d43361f8d3d4f38b9ce0762be6051ed4c867caea4a4adad439' 
  AND token = 'utoItmuxQmii+k1opmZiGaYT+ENpCktcWgSPMkKWkPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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