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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35476fd45ef24817985a85abe8f8b538a359bb3a368ee6ea9b8677c6c40f94b' 
  AND token = 'aVyL444R4j5fzprgT/6NW2wMadHt3rDkzwWp6k4dg6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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