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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e30d0f53adfba814039796f7642452f50f5e24f85c140aa684fd0a333858513' 
  AND token = '3YZwZxW48rpeLICXqb3PR6KOOAAKPjwFtPaNhgl0jxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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