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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513fc7557c22de1ce853369390406bc05dee2f04e9db2f0f182fee649758bc4' 
  AND token = 'iMALJrPd3tGSq+YhBNRXpvC1fOWbxgWyLw1oori/0CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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