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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d696a439c65cb5d45df9c70ef44449fd4d3271cdbae047b7cc0282f5d1de2' 
  AND token = 'qC9P/C2P9K9GifmWJ/tWVQPDgVw+QiZy7LT04dYxg5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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