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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb76bb86d1bb7789da917a02fc217783beeb86a0689d6c54f1da90a254b9377' 
  AND token = 'MdaxGIruZorbE7x7XHva6x8RtesouEUp7cmsUlxovj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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