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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3596f62a7619690bdbe1cfe6a4f7239656a9d641093b5d2de945a712e95c22ab' 
  AND token = 'rGWPU6QB5gH5pJ9idQ5x70ahx4uxaQ5ziHtQWw2qW8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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