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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325e528d189acd7b42f7d25fde598d9a11cf698185d81a4a10e6965bc4314246' 
  AND token = '+sLpvsxpsYrz9aYD8RFqIa91ThQOjLD5VKd5lIibYsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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