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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6032477e2502a639964123aed309196a4d344c6b99f75e13e43d268ef81fe69e' 
  AND token = 'fkljnqqCSsPkFXZCembX0p9AtnBpjRxdgdrEKhZhXrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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