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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e56a4813f9e769c71cc575fd24f08043dfbe7236ce8130064e356cb35d166f' 
  AND token = 'TB4eGaLcnlb0w4F0rqCm95+ZeHjdpxq1/vX9D0NB8CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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