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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cd8ae3ad0dccd280ea8c79943c56167cbc20b8e0ea981c3a07d8011ac25514' 
  AND token = 'd+X39ty/o6ylsnPHvWu4+1NGE+zQm2Z6AKhkv/Mb05g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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