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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db928dcaafb92b37a551f52d8348e6988ff7bdc476a18220a4ad9827a5c50a90' 
  AND token = 'gQP5oG2pUEHg6DB2kReZ8Ic4h4qKlKV2IgssaFrePEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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