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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88311fba0ff2f94c2951b208be2a6fa7c7aaef410a76d8a01bd62140e1b9acd2' 
  AND token = 'vDgMiv+9Nk902DquRKpkaJisMYTKvsU+3wYBzbsydME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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