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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12c874120a3b3a6620a7e769c155bcb918b8e53a5c8dd9908de0a10f1397f64' 
  AND token = 'a8sWOnZENSz5po45/nFed6VHmbM74EBMU8GpUd0pQGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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