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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5095f8d3f91b16644f17463a0445a9228b192f67a25768b7d42aa0cd5eb0354' 
  AND token = '4iCA8083Hcu82i13ZTbnsJrMwViZ8YX9EJ9iratsE9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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