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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda901d7ec5676a59e4d04da4630a7c8147c53ac4b4beec62417d01491f75be9' 
  AND token = '+phdudyPKqepPL/PwrlBo6qf4KnaU/0yXdmrw+b8sZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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