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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356c9f579cb011111621dc4ab8d29199b55349a2434e13103bfd73b9d6d196ea' 
  AND token = 'mrBIUN2LBLPmS2JFbw/pOVw5FVEG1ah/rEazO2r6sEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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