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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6125c6ff8462a0c4c1084f2dc992d014be94e016e1788ab9b084975975cf9aa3' 
  AND token = 'nSQ51XlCUZBf4M49wU9SrxDnMADgYIQz2glavQaeq2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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