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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec48534f4211711abfa6c888e05950826b4dc9d75521fe98d4cbde3ffc301729' 
  AND token = 'vwf9kHJXeJR1ls5jCb40q6JrN9m5jQUdJSG8zaqm8Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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