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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a550c86b9d63dd3ee1d1bafa85863da2b8c276e795fea7cc4a85e94e5fbf2d' 
  AND token = 'wpDj9y505hwPC6QLoUo9eatISHBpRGGUFV6OABKOWbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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