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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc60209d166f0074f7f9e9f1558e3d64b7f56151781ff3c174793f08fdba228b' 
  AND token = 'DzuJmWxeuPK94fk7iqMwSuwU9OamzAyJt+kre7rcizM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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