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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bf2a209cfb31fded71533530b897a9d8bd2b3358ba0c96adfb0fc89a441cd0' 
  AND token = 'gjVWLkhdTK1UjwLgfkf2zbdrnbHsaxJI8udV2MCo9EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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