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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a258fabc35fb4ec084a6c4468cf74bb155092bc1de24e50d1941bf30179d4356' 
  AND token = 'WlGjhQ1ah6WMw9pmWd7KD3Yynh+c0GjWMR0t/63GCMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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