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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ec0841c90907ffeedf3bca0eed2c95af013f16c3190a49792c509e2feebfd3' 
  AND token = 'WRWoCvHCzq9Icqt53u7pMtM+jrABS5qumIA0rXB/v94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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