SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1223559980373acd98b887c01c76f9547db4bfa6bd981426d35758418a7138ce' 
  AND token = 'r5nlrICmXseoYlwH0w4I7QzYbxqaTFj0y/BDv0ApJmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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