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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78146513bd5ebb971808e2c8530eacbce4809cb5f25778e4970f93d79754a42c' 
  AND token = '7wMO2d5yd43eEpd7ILfR4kp0q5j5J8USenucaZhjZ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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