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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fae630b026161b1fc3165eff73b1448b1acd6b99566854071088f863f5fdaa' 
  AND token = '2bNm9QwGrXcXl+GsR1jk800CO9wSafX7UUiiz4gNehM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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