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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411a5f9e157c1a1cecf5d6ec9e9e47abea66ca593ff71bc7fc507d8e518e214' 
  AND token = '8velama+G3sNLuIaGwdpKmYRLuukGFTtnvOS/G07C3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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