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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a444435cfcdcf8d9db31c9dca7080e6e894549917b05663627b8acd44120fd7' 
  AND token = '29Xi5BwLls8R71hWyZrulGpig8cM7PlTsQLiqDdp86E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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