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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2132a402b36d0c0eab9751ca040c2dff3f2660a7ea6cde5a7313fbd67b643956' 
  AND token = 'NAPBy2JKS+iax13yB2NXwQ7CaYr2lUOliuFJQFiIyAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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