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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adf49bb183a147ae640880c8e816ba9ab41a7f457f340f46da9cf7b7a5ee7f9' 
  AND token = '8GII48L5Q9+VTW537YJlm3H+sqs6vhLEyH/wKK9JH6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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