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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b2da3559977f5d8df0f91f45c546445256c30594228fc5310263510fee017' 
  AND token = 'a+jy6EVE7D5Rv6BTCiyrpFZRI/GKpfoRzvQ2kcwVM9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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