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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6097a15478b7bdffb46aadbe3d53b88d2c5eb0c286592ace0d31b23d342bda' 
  AND token = '6tpJfd6+79L2ll27PikX44AvqPu/G1VwT5MBmabnBMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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