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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96aa3cf8782948c3d0da17836ebe021e777e2d7021fe81c56cfe2ed5514e5aa9' 
  AND token = 'Go9pPak9LB32NUV3uKQbl2IMU0hVBbBLxCls5Mu4sNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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