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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4758a748a472db49385db8d881b141600eead6594c571c6725f804664e6f79' 
  AND token = 'D9cGGikLaYd5Ul+MKo2T0RpiurRNXdFAQ7r/fEuQnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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