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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b04bbf0be186b2eb2816711feecf4e76cfdefe86a3fea7416a0ee485b866f3' 
  AND token = '4mRvF5DqVPSD9dqk1Vjkf0yqC6HqWgRuzwYlPdfT8qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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