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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6a30d42c97264644a990d596f0683bf76cf9d6c25b4f13cf6b64d0fa8c9ef1' 
  AND token = 'TMsIPGGFIhW3ANolRkNWCiG+OPOg6ACzrMdI5ED8EZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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