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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c11ad5a1baac747fd460d91b48d6ad81216eb32fe88d95a75bf4f22afd7b1be' 
  AND token = 'MlkQveEfpTg7rTPvIOzlR2kDWpaYjV836F1GX8mh4ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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