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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ffaf36aa0ea22a639f697ad9f8e8bc82bb618bd2f395c1aa67ff99407905d4' 
  AND token = 'tDax/KGWgxguBb3tBA4oAjTIJTO1WDQaP2eSQ6eG6mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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