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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7baf11d4ab7a117d9ea55d6a16cf92ecaf1eac98962d78632f328a4cdb16178' 
  AND token = '+wo6M8gon5CXbr360rfbMl8IOh/czvCkZ+AmneIvY3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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