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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39da963bfdae7b37b907b9e7e9369235979a9dd1bf5c655755444722bc631178' 
  AND token = 'Kzjn4XrERUenO3fwGVJ3H/z7K34/PxLyO/MuTp5DGtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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