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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3475c96176b616ed05678c20abc9dbdc73c96aabe26cdc6b65ca5c35e3babd' 
  AND token = 'SGMJWyL/VZM7ltHZcxDA7H/rqsBVWGlug9CgypgZTdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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