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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe58a4994bc73cba9f10b815b2467c68ab20fa999b2ffeedd3bae9ff63e5194' 
  AND token = 'K57L/Oxg560FFLwBHc8jt1kmu5es6u+Cy6QwxhUzA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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