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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd744f8302fdd2859e3c4e53e1c0d4001a643987d039c83888e29462c484b70bd' 
  AND token = 'T98gURX6cCD7g6wrVQIHJxpcP5N5VkhJ2ugsgi1/AlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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