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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359846c4b986505eaaaff27795e277dcabd756054eee9ae865ef9ff99a793dd4' 
  AND token = 'xImaAxRhZXd9lFcmOAeaVmkSIVO8lPKrJ56EcCl8qgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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