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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd641b268c98a70d0eb291eb0c0e5bbaebca2a2bd06534cc500644a1ba8f6e92' 
  AND token = 'WUcwMatJWjv6aLOm5ZHYiwgubJVpMudSQaEHUeAKTdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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