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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29090ff54829d6e0ff06588e0726d4b4091a70fce2c0a252dd48a231817d10ae' 
  AND token = 'uKrYKkyohvLc+o3uhbcv0LYpWhchyefCWuYIkoE/WX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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