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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916e9c63ef7fb713ad702c1cf09947fd55750404e8bdc141616ca7999e9a6f14' 
  AND token = 'TmWbRMl7mXaCHu6Plg5erZYd8pNE+pnbU4He5tuMW2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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