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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f88a55f71592587ef9a97a84b101ee3e10609823c78531b41bffe20c518dfc1' 
  AND token = 'DNlcs4c+7MyqSvE8Uno+Vs9L4bV3hqyN/lL9KtUG9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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