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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fee146bdf72ae95cc6ca0d2835eb9f6ec83ffb5ac094589a44944d104d7361' 
  AND token = 'qNF/WlFZQVy+/uS9JTbI65A9F/6yukBEoHG6weU4ymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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