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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67213f8c62a9e69e261b65cc7ca456dd64648c98ff63b19bd36f29fa5b590e40' 
  AND token = 'CeuCp1YOA5eVbmzwkOMUnXNfbxSwOCqPZrlDCxya2yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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