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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc33758d48031282c7408f6e9cf7c4fadadef17694f90e0698ee189de35aeda' 
  AND token = 'L53vyDc1pU6c4cAd7swDWdGl3W90UM/eEEjHIGwUp6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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