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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b890ceda7b67fecd7dc938eec8b34a7388d9b9d9c60e234f6202495e9cb100' 
  AND token = '6QtkfMphT1FHoffMLKuLjJCTkyB9rQE028nk0XUDF6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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