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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117538386bf697859a8808d77eba2b8c793324a526aa63b02cf22e05e0de711a' 
  AND token = '/15qecF6ENHW9zTuiAn5G7J1qxLlpmkVZOu3ZfOpiEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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