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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5306fc732e7f01cba82aa452c84035c172f5f7affe4a8866ca1077b1cc384e5e' 
  AND token = 'Se8lQalG/FG3EhUIBaF1MkJgEJrF6InkVWgOo/gVApE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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