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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0a3058cb2552927c1ab7f5817f4bc5cb0264a94939051653e8a9edeb7b6a27' 
  AND token = 'QVjSUwQVclCWS92dv6CdRBoV3IckjGS3dO1MdbuDlC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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