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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bb89e52be36af7db32ad50e7d84fe2785267c001d160b21f0a2ff7d4bc9f1b' 
  AND token = 'iKmv27DcBVDIL2y58LVrGul96JxY/mmrPAX/dPH2dRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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