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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56c5e48a36b481cc98442ed70ba19dda771a6658b15eb6fd488eec7008421f6' 
  AND token = 'Man1jThIDfpw0XEJ1C66cA6Ra9MPv1vGH8F7besclt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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