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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad62cd78b6045cd3fd3e1e7f133c0781d813e76ca11845a2d05ab331de8a7fdb' 
  AND token = 'rtcS/OIVQgYwCpIkGMl6ZTMEMu55OMRtt2Zt35y5qOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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